Abstract: A heater core assembly includes a heater core having two tube stubs projecting therefrom. Two heater tubes engage the two tube stubs, respectively, to define respective abutting interfaces therewith. A clamp couples the heater tubes to corresponding ones of the tube stubs. The clamp includes a first bracket half having two arcuately-shaped openings formed therein for accommodating the stub/tube pairs at the abutting interfaces to permit the stub/tube pairs to extend transversely to the clamp. A second bracket half is hinge connected to the first bracket to permit opening and closing of the clamp. The second bracket half likewise has two arcuately-shaped openings to accommodate the stub/tube pairs when the second bracket half is pivoted onto the first bracket half. The clamp snugly holds the stub/tube pairs when closed. The first and second bracket halves have a thickness measured in the longitudinal direction of each of the stub/tube pairs to extend beyond the abutting interfaces.

Abstract: A method and apparatus for controlling the operation of a flowing or producing well utilising: a downhole located pressure monitoring device which is operative to monitor a characteristic pressure profile of the flowing well, and to respond when a significant deviation to the pressure profile is introduced into the well as a control signal to the monitoring device; and an actuator which is initiated into operation to control any required operation of the well when the monitoring device responds to the control signal.

Abstract: A pressure barrier apparatus 2 for providing a removable pressure barrier in a borehole is described. The apparatus comprises a housing 6, 8 defining a central bore 10 having a first part 20 and a second part 22 separated by an erodeable pressure barrier member 18. The housing also defines a second fluid flow passage 12 for connecting the first part to the second part, and a plurality of conduits 24 for directing fluid onto the barrier member to cause erosion of the barrier member. A sleeve 30 has a first condition in which fluid communication between the first part 20 and the second fluid flow passage 12 is prevented, and a second condition in which fluid is permitted to flow from the first part to the second fluid flow passage to cause erosion of the barrier member.

Abstract: A method for repeatably providing large operating forces to actuate a remote device in a well which includes well production means penetrating to some depth, surface means for restricting or closing-off flow of product from the well and changing well pressure during an operating sequence of the well, at least one downhole pressure storage chamber, a valve communicating between the pressure storage chamber and prevailing well pressure, a piston/cylinder device coupled with the remote device to actuate the latter, and isolation valve for controlling the supply of pressure energy from the storage chamber to the piston/cylinder device. The method includes the steps of replenishably storing pressure in the storage chamber during the operating sequence, such stored pressure being derived from fluid flow permitted by the valve, and repeatably operating the isolation valve to apply differential pressure to the piston/cylinder device to actuate the remote device.

Abstract: The claim over prior art is for an approach to an electronically controlled or electronically monitored breathing system that represents an improvement in electrical reliability, manufacturing cost and efficiency, user maintenance, system reliability, user cost and maintenance. These improvements are accomplished by placing the major electronic, mechanical and electromechanical control elements and sensor components in a single replaceable module.

Abstract: The present claim enables a breathing system to be assessed with a minimum of attention or experience regardless of type of breathing system. This is achieved by creating an electronic control system for the breathing system which converts all available parameters which affect the ongoing use of the breathing system and converting those parameters in a common basis of time remaining of practical use on the breathing system. The electronic system then combines the common parameters in time and combines as appropriate to produce a single time remaining parameter pertaining to the breathing machine operation. This approach is applied across rebreather and open circuit, land and water based systems such that an operator may use similar skills to interpret the output indications of different types of machines.

Abstract: A reactor pressure vessel supports the flanges of a core barrel assembly and an upper support plate. These flanges have aligned holes for diverting inlet coolant water to the vessel head for cooling the head. The aligned holes have different cross-sectional areas for controlling unexpected backflow of coolant water from the vessel head around the periphery of the upper support plate.